Special design 4 flute milling machine Milling cutter usually used for mounting on milling machine Can process heat treatment mold directly or precisely High toughness, abrasion resistance, fast cutting for high hardness Suitable for: lock steel, wrought iron, carbon steel, alloy steel, chisel steel, general iron material, etc. Groove: 4 end mill bits Cutting diameter: 4mm/0.16", 6mm/0.24", 8mm/0.31", 10mm/0.39", 12mm/0.47" Package included: 5 x milling cutters